The keyword phrase is an interrogative clause, a type of sentence structure used to ask a question. As a complete thought, it does not function as a single part of speech. However, the grammatical subject and the core topic of the inquiry is the proper noun phrase "Veterans Day." This compound noun is the central element that the rest of the clause seeks to define in terms of time.
A detailed grammatical breakdown reveals the function of each component. "When" is an interrogative adverb that initiates the question about time. "Is" serves as a linking verb. "Veterans Day" is a compound proper noun, with "Veterans" acting as a noun adjunct modifying the head noun "Day." The final element, "in nov," is a prepositional phrase that further specifies the temporal context of the query. The entire construction is a direct inquiry where the proper noun is the subject whose temporal attribute is being questioned.
For the purpose of developing an article, the most crucial part of speech to identify as the main point is the proper noun "Veterans Day." While the full phrase represents the user's intent to find a date, the noun itself is the semantic anchor and the primary topic. All content should be structured around this central subject, with the article's main goal being to provide the specific information (the date) requested by the interrogative adverb "when."
